Happy to stand corrected.
Thinking "notified period of stay" in the context of rule 2.2 refers to your permission of stay stamp.
Not to be confused with " notification of address" (90 day report)
So when someone exits Thailand and returns with reentry stamp their "notified period of stay" is protected and they do not need to file a TM30 if returning to their usual address.
On the other hand if they returned on a new visa or visa exempt then they would need to file a TM30 even if returning to usual place of residence.
There is no confusion with the intention of the change in rules June 2020.
It was to do away with the need to file a TM30 for any trip out of province and also international travel for those expats living in Thailand.